Based on the laws of technical system evolution of TRIZ theory, we study on the evolution route of a kind of mechantronics product (plastic bottle recycling device), and conduct the innovation design of the device. Then, after the process of system scheme, working process and the overall structure design, we develop a new kind of environmental protection device which can set machinery, electronics, embedded system, wireless network and computer technology as a whole. The device is provided with the function of plastic bottle collecting, crushing, storage and reuse, also a reward system is equipped.